Thank you for following Bertha
The SR 99 tunneling machine, nicknamed Bertha, has completed her work. For the latest tunnel progress, visit our new tracker page.
An abbreviated history of Bertha:
- July 2013: Began tunneling
- April 2017: Tunneling breakthrough
- August 2017: Final piece of dismantled machine removed
While Bertha was underground, this page tracked her progress beneath Seattle. With the machine dismantled and removed, we are now tracking tunnel progress on a new page.